Synthesis and characterisation of unsymmetrical six-aromatic ring containing bent-shaped compounds

Abstract

A new series of achiral unsymmetrical six-aromatic ring banana-shaped compounds has been synthesised and characterised by polarising optical microscopy, differential scanning calorimetry and X-ray diffraction. The lower homologue (C₆) exhibits an intercalated B6 phase. The middle homologues (C₁₀, C₁₂) form only a B1 phase while higher homologues (C₁₄, C₁₆, C₁₈) exhibit a B2 mesophase.

Keywords:

• unsymmetrical bent-shaped mesogen
• Schiff's base
• B2 phase
• B1 phase
• B6 phase

Acknowledgements

We thank DST (New Delhi) for financial assistance. Two of us (S.C. and P.K.S.) are grateful to CSIR (New Delhi) for their fellowships. We thank Dr Raghunathan of the Raman Research Institute, Bangalore, for providing the HRXRD data. We also thank CMRI, Bhavnagar, for providing X-ray facilities.